Update Slate dependencies

Fixes decaporg#1432
Update Slate and Slate plugin dependencies to be up to date with current versions.
Change setBlock -> setBLocks according to deprecation warning in slate 0.33.0
Change node.kind -> node.object according to deprecation warning in Slate 0.32.0
Update Jest snapshot to pass the change from node.kind -> node.object

package.json

@@ -178,12 +178,12 @@
     "remark-stringify": "^3.0.1",
     "sanitize-filename": "^1.6.1",
     "semaphore": "^1.0.5",
-    "slate": "^0.30.0",
-    "slate-edit-list": "^0.10.1",
-    "slate-edit-table": "^0.12.0",
-    "slate-plain-serializer": "^0.4.0",
-    "slate-react": "0.10.11",
-    "slate-soft-break": "^0.6.0",
+    "slate": "^0.34.0",
+    "slate-edit-list": "^0.11.3",
+    "slate-edit-table": "^0.15.1",
+    "slate-plain-serializer": "^0.5.15",
+    "slate-react": "^0.12.9",
+    "slate-soft-break": "^0.6.1",
     "toml-j0.4": "^1.1.1",
     "tomlify-j0.4": "^3.0.0-alpha.0",
     "unified": "^6.1.4",